openai/gpt-chat-latest → A (4:1)

Side A consolidates canonical path normalization and URL construction into shared `slug_types::paths` newtypes (`GardenItemUrl`, `ForumThreadUrl`, `TildeOntologyPath`) and updates API/RPC types to use those strongly typed representations instead of scattered string helpers. This removes duplicated logic, centralizes canonicalization across crates, and makes many interfaces correct-by-construction, whereas Side B primarily changes the DSL syntax for vote explanations and updates the parser, documentation, fixtures, and tests to match that new format.